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Science. 2016 Oct 14;354(6309):206-209. Epub 2016 Sep 29.

Incorporation of rubidium cations into perovskite solar cells improves photovoltaic performance.

Author information

1
Laboratory of Photonics and Interfaces, École Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland. michael.saliba@epfl.ch michael.graetzel@epfl.ch.
2
Laboratory of Photonics and Interfaces, École Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland. Advanced Research Division, Materials Research Laboratory, Panasonic Corporation, 1006 Kadoma, Kadoma City, Osaka 571-8501, Japan.
3
Laboratory of Photonics and Interfaces, École Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland.
4
Laboratory of Photomolecular Science, École Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland.

Abstract

All of the cations currently used in perovskite solar cells abide by the tolerance factor for incorporation into the lattice. We show that the small and oxidation-stable rubidium cation (Rb+) can be embedded into a "cation cascade" to create perovskite materials with excellent material properties. We achieved stabilized efficiencies of up to 21.6% (average value, 20.2%) on small areas (and a stabilized 19.0% on a cell 0.5 square centimeters in area) as well as an electroluminescence of 3.8%. The open-circuit voltage of 1.24 volts at a band gap of 1.63 electron volts leads to a loss in potential of 0.39 volts, versus 0.4 volts for commercial silicon cells. Polymer-coated cells maintained 95% of their initial performance at 85°C for 500 hours under full illumination and maximum power point tracking.

PMID:
27708053
DOI:
10.1126/science.aah5557

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